Ian, age 62, presents with a wide, diffuse area of erythematous skin on his lower left leg that is warm and tender to palpation.There is some edema involved.You suspect:

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The symptoms described are typical of cellulitis - an infection of the skin and subcutaneous tissue. Necrotizing fasciitis involves more severe and rapidly progressing symptoms such as fever, severe pain, and rapidly spreading skin necrosis. Kaposi's sarcoma presents with purple or red lesions on the skin and is more commonly seen in individuals with weakened immune systems, such as those with HIV. A diabetic ulcer would typically present as a localized area of skin breakdown rather than a diffuse area of erythema.

Ian, Age 62, Presents with a Wide, Diffuse Area of Erythematous